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i <br /> Amer Environmental Netvvork <br /> L <br /> PAGE 6 <br /> LAEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER: 9611148 <br /> CLIENT PROJECT ID: 420;3-F1 <br /> Quality Control Summary <br /> i <br /> Due to a matrix effect, the surrogate recovery 'for terphenyl by EPA 8270 was <br /> outside of QC limits. <br /> LAll other laboratory quality control parameters were found to be within <br /> established limits. <br /> L i <br /> Definitions <br /> L 'Laboratory Control Sample (LCS)/Method Spike(s): Control samples of known composition. LCS and Method Spike <br /> data are used to validate batch analytical results. <br /> Matrix Spike(s): Aliquot of a sample (aqueous or solid) with added quantities of specific compounds and <br /> subjected to the entire analytical procedure. Matrix spike and matrix spike duplicate QC data are advisory. <br /> II <br /> Method Blank: An analytical control consisting of all reagents, internal standards, and surrogate standards <br /> carried through the entire analytical process. Used to monitor laboratory background and reagent contamination. <br /> Not Detected (ND): Not detected at or above the reporting limit. <br /> Relative Percent Difference (RPD): An indication of method precision based on duplicate analysis. <br /> Reporting Limit (RL): The lowest concentration routinely determinedl"during laboratory operations. The RL is <br /> generally 1 to 10 times the Method Detection Limit (MDL). Reporting limits are matrix, method, and analyte <br /> dependent and take into account any dilutions performed as part of $he analysis. <br /> Surrogates: Organic compounds which are similar to analytes of interest in chemical behavior, but are not found <br /> in environmental samples. Surrogates are added to aLL blanks, calibration and check standards, samples, and <br /> spiked samples. Surrogate recovery is monitored as an indication of acceptable sample preparation and <br /> instrumental performance. h ' <br /> D: Surrogates diluted out. <br /> #: Indicates result outside of established laboratory QC limits. <br /> i <br />